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Description
London had many marshaling yards, and the Southern had three of these, Feltham, Norwood, and Hither Green, and the routes around London particularly on the Southern were electrified with heavy commuter traffic, taking priority over the freight traffic, junctions, and many signal stops, that coupled by the many flyovers meaning that any locomotive built for the job needed to have impressively high acceleration.

The design was needed to be a tank engine for its quick acceleration, shorter range, and the likely hood of having to infrequently run in the opposite direction, at first it was proposed that they use the Z Class, but its specialised design meant that it would be unsuitable.

As such a new design was constructed, this loco was described as a tank engine version of the N1 Class or a smaller wheeled version of the three-cylinder K1. The design was built utilsing leftover parts from the converted K and K1, these being trailing bogies and leading wheels, they utilised the same boiler as the previous classes.

Their building was rather muddy, originally 10 were ordered from Eastleigh, with Frames built at Ashford and the Boilers at Brighton, but a trade recession in the early 30s' meant that the frames were stored and boilers given to N and U classes, These orders would finally arrive between January and February 1932, with the second batch coming online in 1935 and the final batch of five in 1936.

They did fine work and were well-liked by the crews, having impressively powerful brakes, given to the engines for the heavy often, unfitted goods trains.

The first to be withdrawn was that of No31923 on the 2nd of February 1963, and the last members would be that of 31912 and 31914 on the 30th of August 1964.

Credits: BaconOverlord582, LocoSprites and Swiftwin4ds. Sprite Created by StrawberrySteam, edits, and posted by Midnight Express

Description
London had many marshaling yards, and the Southern had three of these, Feltham, Norwood, and Hither Green, and the routes around London particularly on the Southern were electrified with heavy commuter traffic, taking priority over the freight traffic, junctions, and many signal stops, that coupled by the many flyovers meaning that any locomotive built for the job needed to have impressively high acceleration.

The design was needed to be a tank engine for its quick acceleration, shorter range, and the likely hood of having to infrequently run in the opposite direction, at first it was proposed that they use the Z Class, but its specialised design meant that it would be unsuitable.

As such a new design was constructed, this loco was described as a tank engine version of the N1 Class or a smaller wheeled version of the three-cylinder K1. The design was built utilsing leftover parts from the converted K and K1, these being trailing bogies and leading wheels, they utilised the same boiler as the previous classes.

Their building was rather muddy, originally 10 were ordered from Eastleigh, with Frames built at Ashford and the Boilers at Brighton, but a trade recession in the early 30s' meant that the frames were stored and boilers given to N and U classes, These orders would finally arrive between January and February 1932, with the second batch coming online in 1935 and the final batch of five in 1936.

They did fine work and were well-liked by the crews, having impressively powerful brakes, given to the engines for the heavy often, unfitted goods trains.

The first to be withdrawn was that of No31923 on the 2nd of February 1963, and the last members would be that of 31912 and 31914 on the 30th of August 1964.

Credits: BaconOverlord582, LocoSprites and Swiftwin4ds. Sprite Created by StrawberrySteam, edits, and posted by Midnight Express